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Note 12 - Contingencies (Details) (USD $) | 3 Months Ended
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Mar. 29, 2014
Note 12 - Contingencies (Details) [Line Items] |
Proceeds From Insurance Settlements | $ 1,300,000
Cost of Sales [Member] |
Note 12 - Contingencies (Details) [Line Items] |
Proceeds From Insurance Settlements | 1,100,000
General and Administrative Expense [Member] |
Note 12 - Contingencies (Details) [Line Items] |
Proceeds From Insurance Settlements | $ 25,000

X
- Details
Name: | iiin_Note12ContingenciesDetailsLineItems
Namespace Prefix: | iiin_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Total cash received upon settlement of an insurance claim during the current period. + References No definition available. + Details
Name: | iiin_ProceedsFromInsuranceSettlements
Namespace Prefix: | iiin_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration